Diff: BrightnessScreen.h

Revision:

0:da2b8c7a1ec1

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/BrightnessScreen.h	Mon May 11 15:25:52 2015 +0000
@@ -0,0 +1,224 @@
+/**
+@file BrightnessScreen.h
+
+
+*/
+#ifndef BRIGHTNESSSCREEN_H
+#define BRIGHTNESSSCREEN_H
+
+#include "SettingController.h"
+#include "Inputs.h"
+
+
+/**
+
+@brief Shows the current brightness setting of the LCD backlight brightness\n
+@brief Consists of a Setting Controller\n
+@brief brightness can be set to 100%, 50%, 25%, or Off\n
+@brief the setting is persistent i.e saved onto onboard flash memory\n
+@author Augustine K Kizito\n
+@date April 2015
+
+*/
+
+
+
+class BrightnessScreen: public SettingController // inherit SettingController class
+{
+private:
+    bool changeScreen; // tracks if the user pressed a button that changes the screen
+    char *brightnessKey; // key to be used for the cfg file
+    char brightnessValue[BUFSIZ]; // buffer to store the brightness value retrieved from cfg file
+    int brightness; // the brightness stored as an int
+
+    void onScrollUp(); // user pressed the scroll up button
+    void onScrollDown(); // user pressed the scroll down button
+    void onEnter(); // user pressed the enter button
+    void onBack(); // user pressed the back button
+    void saveSetting(); // save a selected option as a setting
+    void adjustBrightness(); //adjust brightness according to the stored setting
+
+public:
+    /**
+    This function creates an instance of the brightness screen
+    
+    */
+    BrightnessScreen()
+        :SettingController( "Brightness", // Title
+                            "100%", // Option 1
+                            "50%", // Option 2
+                            "25%", // Option 3
+                            "Off", // Option 4
+                            4) // Number of Options
+    {};
+    /**
+    This function manages the exectution of the brightness screen
+    
+    @returns
+     -1 - navigate to previous screen
+    */
+    int start();
+
+};
+
+
+
+int BrightnessScreen::start()
+{
+
+    enterButton.mode(PullDown); // activate pull down resistor
+    upButton.mode(PullDown); // activate pull down resistor
+    downButton.mode(PullDown); // acivate pull down resistor
+    backButton.mode(PullDown); // activate pull down resistor
+
+    upButton.rise(this,&BrightnessScreen::onScrollUp); // call onScrollUp when the up button is pressed
+    downButton.rise(this,&BrightnessScreen::onScrollDown); // call onScrollDown when the down button is pressed
+    enterButton.rise(this,&BrightnessScreen::onEnter); // call onEnter when the enter button is pressed
+    backButton.rise(this, &BrightnessScreen::onBack);
+
+    brightnessKey = "brightness ";
+
+    // prepare the cfg file to be read
+    cfg.read("/local/bright.cfg");
+
+    // if key aand value exist, retrieve and store
+    if (cfg.getValue(brightnessKey, &brightnessValue[0], sizeof(brightnessValue))) { // if key aand value exist, retrieve and store
+
+        brightness = atoi(brightnessValue); // convert string to integer
+        currentBrightness = brightness;
+        // set the ListController setting appropriateley
+        if (brightness == 100) {
+            SettingController::setCurrentSetting(0);
+        } else if (brightness == 50) {
+            SettingController::setCurrentSetting(1);
+        } else if (brightness == 25) {
+            SettingController::setCurrentSetting(2);
+        } else {
+            SettingController::setCurrentSetting(3);
+        }
+    }
+
+    adjustBrightness(); // adjust brightness apprpriately
+    SettingController::showInfo(); //populate the settingController
+    changeScreen = false; // stay on this screen until further notice
+
+    while(!changeScreen) {
+        // mbed goes to sleep to save power
+        Sleep();
+    }
+
+    // detach all interrupts
+    enterButton.rise(NULL);
+    backButton.rise(NULL);
+
+    return -1; // go to the previous screen
+
+}
+
+void BrightnessScreen::onEnter()
+{
+    if (debounceSuccess()) { // debouncing successful
+        //sound the buzzer
+        playSound();
+        // save the selected option as the new setting
+        saveSetting();
+
+        //change the setting marker on the screen accordingly
+        SettingController::changeSetting();
+
+        //adjust the brigtness accordingly
+        adjustBrightness();
+
+
+        // reset the debounce timer
+        debounce.reset();
+    }
+
+}
+
+void BrightnessScreen::onBack()
+{
+    
+    if (debounceSuccess()) { // debouncing successful
+        // sound the buzzer
+        playSound();
+        changeScreen = true; // user wants to change screen
+
+        // reset the debounce timer
+        debounce.reset();
+    }
+
+
+}
+
+void BrightnessScreen::onScrollDown()
+{
+    if (debounceSuccess()) { // debouncing successful
+
+        SettingController::scrollDown(); //scroll Up
+        // reset the timer
+        debounce.reset();
+    }
+
+}
+
+void BrightnessScreen::onScrollUp()
+{
+    if (debounceSuccess()) { // debouncing successful
+
+        SettingController::scrollUp(); //scroll Down
+        // reset the debounce timer
+        debounce.reset();
+    }
+
+}
+
+void BrightnessScreen::saveSetting()
+{
+    // retrieve the current option
+    int currentOption = SettingController::getCurrentOption();
+
+
+
+    if ( currentOption == 0) {
+        cfg.setValue(brightnessKey,"100");  //100%
+    } else if ( currentOption == 1) {
+        cfg.setValue(brightnessKey,"50");  //50%
+    } else if ( currentOption == 2) {
+        cfg.setValue(brightnessKey,"25");  //25%
+    } else if ( currentOption == 3) {
+        cfg.setValue(brightnessKey,"0");  //Off
+    } else {
+        // do nothing
+    }
+
+    // write data to the file
+    cfg.write("/local/bright.cfg");
+
+}
+
+void BrightnessScreen::adjustBrightness()
+{
+
+    // retireve currentSetting
+    int currentSetting = SettingController::getCurrentSetting();
+
+    if ( currentSetting == 0) {  // 100%
+        currentBrightness = 100;
+        lcd.setBrightness(1.0);
+    } else if ( currentSetting == 1) { // 50%
+        currentBrightness = 50;
+        lcd.setBrightness(0.5);
+    } else if ( currentSetting == 2) { // 25%
+        currentBrightness = 25;
+        lcd.setBrightness(0.25);
+    } else if ( currentSetting == 3) { // Off
+        currentBrightness = 0;
+        lcd.setBrightness(0);
+    } else {
+        // do nothing
+    }
+
+}
+
+#endif